/*
* Copyright (c) 2016 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <linux/export.h>
#include <linux/uaccess.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_auth.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem.h>
#include <drm/drm_print.h>
#include <drm/drm_util.h>
#include "drm_crtc_internal.h"
#include "drm_internal.h"
/**
* DOC: overview
*
* Frame buffers are abstract memory objects that provide a source of pixels to
* scanout to a CRTC. Applications explicitly request the creation of frame
* buffers through the DRM_IOCTL_MODE_ADDFB(2) ioctls and receive an opaque
* handle that can be passed to the KMS CRTC control, plane configuration and
* page flip functions.
*
* Frame buffers rely on the underlying memory manager for allocating backing
* storage. When creating a frame buffer applications pass a memory handle
* (or a list of memory handles for multi-planar formats) through the
* &struct drm_mode_fb_cmd2 argument. For drivers using GEM as their userspace
* buffer management interface this would be a GEM handle. Drivers are however
* free to use their own backing storage object handles, e.g. vmwgfx directly
* exposes special TTM handles to userspace and so expects TTM handles in the
* create ioctl and not GEM handles.
*
* Framebuffers are tracked with &struct drm_framebuffer. They are published
* using drm_framebuffer_init() - after calling that function userspace can use
* and access the framebuffer object. The helper function
* drm_helper_mode_fill_fb_struct() can be used to pre-fill the required
* metadata fields.
*
* The lifetime of a drm framebuffer is controlled with a reference count,
* drivers can grab additional references with drm_framebuffer_get() and drop
* them again with drm_framebuffer_put(). For driver-private framebuffers for
* which the last reference is never dropped (e.g. for the fbdev framebuffer
* when the struct &struct drm_framebuffer is embedded into the fbdev helper
* struct) drivers can manually clean up a framebuffer at module unload time
* with drm_framebuffer_unregister_private(). But doing this is not
* recommended, and it's better to have a normal free-standing &struct
* drm_framebuffer.
*/
int drm_framebuffer_check_src_coords(uint32_t src_x, uint32_t src_y,
uint32_t src_w, uint32_t src_h,
const struct drm_framebuffer *fb)
{
unsigned int fb_width, fb_height;
fb_width = fb->width << 16;
fb_height = fb->height << 16;
/* Make sure source coordinates are inside the fb. */
if (src_w > fb_width ||
src_x > fb_width - src_w ||
src_h > fb_height ||
src_y > fb_height - src_h) {
drm_dbg_kms(fb->dev, "Invalid source coordinates "
"%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
src_w >> 16, ((src_w & 0xffff) * 15625) >> 10,
src_h >> 16, ((src_h & 0xffff) * 15625) >> 10,
src_x >> 16, ((src_x & 0xffff) * 15625) >> 10,
src_y >> 16, ((src_y & 0xffff) * 15625) >> 10,
fb->width, fb->height);
return -ENOSPC;
}
return 0;
}
/**
* drm_mode_addfb - add an FB to the graphics configuration
* @dev: drm device for the ioctl
* @or: pointer to request structure
* @file_priv: drm file
*
* Add a new FB to the specified CRTC, given a user request. This is the
* original addfb ioctl which only supported RGB formats.
*
* Called by the user via ioctl, or by an in-kernel client.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_addfb(struct drm_device *dev, struct drm_mode_fb_cmd *or,
struct drm_file *file_priv)
{
struct drm_mode_fb_cmd2 r = {};
int ret;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
r.pixel_format = drm_driver_legacy_fb_format(dev, or->bpp, or->depth);
if (r.pixel_format == DRM_FORMAT_INVALID) {
drm_dbg_kms(dev, "bad {bpp:%d, depth:%d}\n", or->bpp, or->depth);
return -EINVAL;
}
/* convert to new format and call new ioctl */
r.fb_id = or->fb_id;
r.width = or->width;
r.height = or->height;
r.pitches[0] = or->pitch;
r.handles[0] = or->handle;
ret = drm_mode_addfb2(dev, &r, file_priv);
if (ret)
return ret;
or->fb_id = r.fb_id;
return 0;
}
int drm_mode_addfb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
return drm_mode_addfb(dev, data, file_priv);
}
static int framebuffer_check(struct drm_device *dev,
const struct drm_mode_fb_cmd2 *r)
{
const struct drm_format_info *info;
int i;
/* check if the format is supported at all */
if (!__drm_format_info(r->pixel_format)) {
drm_dbg_kms(dev, "bad framebuffer format %p4cc\n",
&r->pixel_format);
return -EINVAL;
}
if (r->width == 0) {
drm_dbg_kms(dev, "bad framebuffer width %u\n", r->width);
return -EINVAL;
}
if (r->height == 0) {
drm_dbg_kms(dev, "bad framebuffer height %u\n", r->height);
return -EINVAL;
}
/* now let the driver pick its own format info */
info = drm_get_format_info(dev, r);
for (i = 0; i < info->num_planes; i++) {
unsigned int width = drm_format_info_plane_width(info, r->width, i);
unsigned int height = drm_format_info_plane_height(info, r->height, i);
unsigned int block_size = info->char_per_block[i];
u64 min_pitch = drm_format_info_min_pitch(info, i, width);
if (!block_size && (r->modifier[i] == DRM_FORMAT_MOD_LINEAR)) {
drm_dbg_kms(dev, "Format requires non-linear modifier for plane %d\n", i);
return -EINVAL;
}
if (!r->handles[i]) {
drm_dbg_kms(dev, "no buffer object handle for plane %d\n", i);
return -EINVAL;
}
if (min_pitch > UINT_MAX)
return -ERANGE;
if ((uint64_t) height * r->pitches[i] + r->offsets[i] > UINT_MAX)
return -ERANGE;
if (block_size && r->pitches[i] < min_pitch) {
drm_dbg_kms(dev, "bad pitch %u for plane %d\n", r->pitches[i], i);
return -EINVAL;
}
if (r->modifier[i] && !(r->flags & DRM_MODE_FB_MODIFIERS)) {
drm_dbg_kms(dev, "bad fb modifier %llu for plane %d\n",
r->modifier[i], i);
return -EINVAL;
}
if (r->flags & DRM_MODE_FB_MODIFIERS &&
r->modifier[i] != r->modifier[0]) {
drm_dbg_kms(dev, "bad fb modifier %llu for plane %d\n",
r->modifier[i], i);
return -EINVAL;
}
/* modifier specific checks: */
switch (r->modifier[i]) {
case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
/* NOTE: the pitch restriction may be lifted later if it turns
* out that no hw has this restriction:
*/
if (r->pixel_format != DRM_FORMAT_NV12 ||
width % 128 || height % 32 ||
r->pitches[i] % 128) {
drm_dbg_kms(dev, "bad modifier data for plane %d\n", i);
return -EINVAL;
}
break;
default:
break;
}
}
for (i = info->num_planes; i < 4; i++) {
if (r->modifier[i]) {
drm_dbg_kms(dev, "non-zero modifier for unused plane %d\n", i);
return -EINVAL;
}
/* Pre-FB_MODIFIERS userspace didn't clear the structs properly. */
if (!(r->flags & DRM_MODE_FB_MODIFIERS))
continue;
if (r->handles[i]) {
drm_dbg_kms(dev, "buffer object handle for unused plane %d\n", i);
return -EINVAL;
}
if (r->pitches[i]) {
drm_dbg_kms(dev, "non-zero pitch for unused plane %d\n", i);
return -EINVAL;
}
if (r->offsets[i]) {
drm_dbg_kms(dev, "non-zero offset for unused plane %d\n", i);
return -EINVAL;
}
}
return 0;
}
struct drm_framebuffer *
drm_internal_framebuffer_create(struct drm_device *dev,
const struct drm_mode_fb_cmd2 *r,
struct drm_file *file_priv)
{
struct drm_mode_config *config = &dev->mode_config;
struct drm_framebuffer *fb;
int ret;
if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS)) {
drm_dbg_kms(dev, "bad framebuffer flags 0x%08x\n", r->flags);
return ERR_PTR(-EINVAL);
}
if ((config->min_width > r->width) || (r->width > config->max_width)) {
drm_dbg_kms(dev, "bad framebuffer width %d, should be >= %d && <= %d\n",
r->width, config->min_width, config->max_width);
return ERR_PTR(-EINVAL);
}
if ((config->min_height > r->height) || (r->height > config->max_height)) {
drm_dbg_kms(dev, "bad framebuffer height %d, should be >= %d && <= %d\n",
r->height, config->min_height, config->max_height);
return ERR_PTR(-EINVAL);
}
if (r->flags & DRM_MODE_FB_MODIFIERS &&
dev->mode_config.fb_modifiers_not_supported) {
drm_dbg_kms(dev, "driver does not support fb modifiers\n");
return ERR_PTR(-EINVAL);
}
ret = framebuffer_check(dev, r);
if (ret)
return ERR_PTR(ret);
fb = dev->mode_config.funcs->fb_create(dev, file_priv, r);
if (IS_ERR(fb)) {
drm_dbg_kms(dev, "could not create framebuffer\n");
return fb;
}
return fb;
}
EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_internal_framebuffer_create);
/**
* drm_mode_addfb2 - add an FB to the graphics configuration
* @dev: drm device for the ioctl
* @data: data pointer for the ioctl
* @file_priv: drm file for the ioctl call
*
* Add a new FB to the specified CRTC, given a user request with format. This is
* the 2nd version of the addfb ioctl, which supports multi-planar framebuffers
* and uses fourcc codes as pixel format specifiers.
*
* Called by the user via ioctl.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_addfb2(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_fb_cmd2 *r = data;
struct drm_framebuffer *fb;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
fb = drm_internal_framebuffer_create(dev, r, file_priv);
if (IS_ERR(fb))
return PTR_ERR(fb);
drm_dbg_kms(dev, "[FB:%d]\n", fb->base.id);
r->fb_id = fb->base.id;
/* Transfer ownership to the filp for reaping on close */
mutex_lock(&file_priv->fbs_lock);
list_add(&fb->filp_head, &file_priv->fbs);
mutex_unlock(&file_priv->fbs_lock);
return 0;
}
int drm_mode_addfb2_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
#ifdef __BIG_ENDIAN
if (!dev->mode_config.quirk_addfb_prefer_host_byte_order) {
/*
* Drivers must set the
* quirk_addfb_prefer_host_byte_order quirk to make
* the drm_mode_addfb() compat code work correctly on
* bigendian machines.
*
* If they don't they interpret pixel_format values
* incorrectly for bug compatibility, which in turn
* implies the ADDFB2 ioctl does not work correctly
* then. So block it to make userspace fallback to
* ADDFB.
*/
drm_dbg_kms(dev, "addfb2 broken on bigendian");
return -EOPNOTSUPP;
}
#endif
return drm_mode_addfb2(dev, data, file_priv);
}
struct drm_mode_rmfb_work {
struct work_struct work;
struct list_head fbs;
};
static void drm_mode_rmfb_work_fn(struct work_struct *w)
{
struct drm_mode_rmfb_work *arg = container_of(w, typeof(*arg), work);
while (!list_empty(&arg->fbs)) {
struct drm_framebuffer *fb =
list_first_entry(&arg->fbs, typeof(*fb), filp_head);
drm_dbg_kms(fb->dev,
"Removing [FB:%d] from all active usage due to RMFB ioctl\n",
fb->base.id);
list_del_init(&fb->filp_head);
drm_framebuffer_remove(fb);
}
}
static int drm_mode_closefb(struct drm_framebuffer *fb,
struct drm_file *file_priv)
{
struct drm_framebuffer *fbl;
bool found = false;
mutex_lock(&file_priv->fbs_lock);
list_for_each_entry(fbl, &file_priv->fbs, filp_head)
if (fb == fbl)
found = true;
if (!found) {
mutex_unlock(&file_priv->fbs_lock);
return -ENOENT;
}
list_del_init(&fb->filp_head);
mutex_unlock(&file_priv->fbs_lock);
/* Drop the reference that was stored in the fbs list */
drm_framebuffer_put(fb);
return 0;
}
/**
* drm_mode_rmfb - remove an FB from the configuration
* @dev: drm device
* @fb_id: id of framebuffer to remove
* @file_priv: drm file
*
* Remove the specified FB.
*
* Called by the user via ioctl, or by an in-kernel client.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
struct drm_file *file_priv)
{
struct drm_framebuffer *fb;
int ret;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
fb = drm_framebuffer_lookup(dev, file_priv, fb_id);
if (!fb)
return -ENOENT;
ret = drm_mode_closefb(fb, file_priv);
if (ret != 0) {
drm_framebuffer_put(fb);
return ret;
}
/*
* drm_framebuffer_remove may fail with -EINTR on pending signals,
* so run this in a separate stack as there's no way to correctly
* handle this after the fb is already removed from the lookup table.
*/
if (drm_framebuffer_read_refcount(fb) > 1) {
struct drm_mode_rmfb_work arg;
INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
INIT_LIST_HEAD(&arg.fbs);
drm_WARN_ON(dev, !list_empty(&fb->filp_head));
list_add_tail(&fb->filp_head, &arg.fbs);
schedule_work(&arg.work);
flush_work(&arg.work);
destroy_work_on_stack(&arg.work);
} else
drm_framebuffer_put(fb);
return 0;
}
int drm_mode_rmfb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
uint32_t *fb_id = data;
return drm_mode_rmfb(dev, *fb_id, file_priv);
}
int drm_mode_closefb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_closefb *r = data;
struct drm_framebuffer *fb;
int ret;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
if (r->pad)
return -EINVAL;
fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
if (!fb)
return -ENOENT;
ret = drm_mode_closefb(fb, file_priv);
drm_framebuffer_put(fb);
return ret;
}
/**
* drm_mode_getfb - get FB info
* @dev: drm device for the ioctl
* @data: data pointer for the ioctl
* @file_priv: drm file for the ioctl call
*
* Lookup the FB given its ID and return info about it.
*
* Called by the user via ioctl.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_getfb(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_fb_cmd *r = data;
struct drm_framebuffer *fb;
int ret;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
if (!fb)
return -ENOENT;
/* Multi-planar framebuffers need getfb2. */
if (fb->format->num_planes > 1) {
ret = -EINVAL;
goto out;
}
if (!fb->funcs->create_handle) {
ret = -ENODEV;
goto out;
}
r->height = fb->height;
r->width = fb->width;
r->depth = fb->format->depth;
r->bpp = drm_format_info_bpp(fb->format, 0);
r->pitch = fb->pitches[0];
/* GET_FB() is an unprivileged ioctl so we must not return a
* buffer-handle to non-master processes! For
* backwards-compatibility reasons, we cannot make GET_FB() privileged,
* so just return an invalid handle for non-masters.
*/
if (!drm_is_current_master(file_priv) && !capable(CAP_SYS_ADMIN)) {
r->handle = 0;
ret = 0;
goto out;
}
ret = fb->funcs->create_handle(fb, file_priv, &r->handle);
out:
drm_framebuffer_put(fb);
return ret;
}
/**
* drm_mode_getfb2_ioctl - get extended FB info
* @dev: drm device for the ioctl
* @data: data pointer for the ioctl
* @file_priv: drm file for the ioctl call
*
* Lookup the FB given its ID and return info about it.
*
* Called by the user via ioctl.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_getfb2_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_fb_cmd2 *r = data;
struct drm_framebuffer *fb;
unsigned int i;
int ret = 0;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
if (!fb)
return -ENOENT;
/* For multi-plane framebuffers, we require the driver to place the
* GEM objects directly in the drm_framebuffer. For single-plane
* framebuffers, we can fall back to create_handle.
*/
if (!fb->obj[0] &&
(fb->format->num_planes > 1 || !fb->funcs->create_handle)) {
ret = -ENODEV;
goto out;
}
r->height = fb->height;
r->width = fb->width;
r->pixel_format = fb->format->format;
r->flags = 0;
if (!dev->mode_config.fb_modifiers_not_supported)
r->flags |= DRM_MODE_FB_MODIFIERS;
for (i = 0; i < ARRAY_SIZE(r->handles); i++) {
r->handles[i] = 0;
r->pitches[i] = 0;
r->offsets[i] = 0;
r->modifier[i] = 0;
}
for (i = 0; i < fb->format->num_planes; i++) {
r->pitches[i] = fb->pitches[i];
r->offsets[i] = fb->offsets[i];
if (!dev->mode_config.fb_modifiers_not_supported)
r->modifier[i] = fb->modifier;
}
/* GET_FB2() is an unprivileged ioctl so we must not return a
* buffer-handle to non master/root processes! To match GET_FB()
* just return invalid handles (0) for non masters/root
* rather than making GET_FB2() privileged.
*/
if (!drm_is_current_master(file_priv) && !capable(CAP_SYS_ADMIN)) {
ret = 0;
goto out;
}
for (i = 0; i < fb->format->num_planes; i++) {
int j;
/* If we reuse the same object for multiple planes, also
* return the same handle.
*/
for (j = 0; j < i; j++) {
if (fb->obj[i] == fb->obj[j]) {
r->handles[i] = r->handles[j];
break;
}
}
if (r->handles[i])
continue;
if (fb->obj[i]) {
ret = drm_gem_handle_create(file_priv, fb->obj[i],
&r->handles[i]);
} else {
WARN_ON(i > 0);
ret = fb->funcs->create_handle(fb, file_priv,
&r->handles[i]);
}
if (ret != 0)
goto out;
}
out:
if (ret != 0) {
/* Delete any previously-created handles on failure. */
for (i = 0; i < ARRAY_SIZE(r->handles); i++) {
int j;
if (r->handles[i])
drm_gem_handle_delete(file_priv, r->handles[i]);
/* Zero out any handles identical to the one we just
* deleted.
*/
for (j = i + 1; j < ARRAY_SIZE(r->handles); j++) {
if (r->handles[j] == r->handles[i])
r->handles[j] = 0;
}
}
}
drm_framebuffer_put(fb);
return ret;
}
/**
* drm_mode_dirtyfb_ioctl - flush frontbuffer rendering on an FB
* @dev: drm device for the ioctl
* @data: data pointer for the ioctl
* @file_priv: drm file for the ioctl call
*
* Lookup the FB and flush out the damaged area supplied by userspace as a clip
* rectangle list. Generic userspace which does frontbuffer rendering must call
* this ioctl to flush out the changes on manual-update display outputs, e.g.
* usb display-link, mipi manual update panels or edp panel self refresh modes.
*
* Modesetting drivers which always update the frontbuffer do not need to
* implement the corresponding &drm_framebuffer_funcs.dirty callback.
*
* Called by the user via ioctl.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_clip_rect __user *clips_ptr;
struct drm_clip_rect *clips = NULL;
struct drm_mode_fb_dirty_cmd *r = data;
struct drm_framebuffer *fb;
unsigned flags;
int num_clips;
int ret;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
if (!fb)
return -ENOENT;
num_clips = r->num_clips;
clips_ptr = (struct drm_clip_rect __user *)(unsigned long)r->clips_ptr;
if (!num_clips != !clips_ptr) {
ret = -EINVAL;
goto out_err1;
}
flags = DRM_MODE_FB_DIRTY_FLAGS & r->flags;
/* If userspace annotates copy, clips must come in pairs */
if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY && (num_clips % 2)) {
ret = -EINVAL;
goto out_err1;
}
if (num_clips && clips_ptr) {
if (num_clips < 0 || num_clips > DRM_MODE_FB_DIRTY_MAX_CLIPS) {
ret = -EINVAL;
goto out_err1;
}
clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
if (!clips) {
ret = -ENOMEM;
goto out_err1;
}
ret = copy_from_user(clips, clips_ptr,
num_clips * sizeof(*clips));
if (ret) {
ret = -EFAULT;
goto out_err2;
}
}
if (fb->funcs->dirty) {
ret = fb->funcs->dirty(fb, file_priv, flags, r->color,
clips, num_clips);
} else {
ret = -ENOSYS;
}
out_err2:
kfree(clips);
out_err1:
drm_framebuffer_put(fb);
return ret;
}
/**
* drm_fb_release - remove and free the FBs on this file
* @priv: drm file for the ioctl
*
* Destroy all the FBs associated with @filp.
*
* Called by the user via ioctl.
*
* Returns:
* Zero on success, negative errno on failure.
*/
void drm_fb_release(struct drm_file *priv)
{
struct drm_framebuffer *fb, *tfb;
struct drm_mode_rmfb_work arg;
INIT_LIST_HEAD(&arg.fbs);
/*
* When the file gets released that means no one else can access the fb
* list any more, so no need to grab fpriv->fbs_lock. And we need to
* avoid upsetting lockdep since the universal cursor code adds a
* framebuffer while holding mutex locks.
*
* Note that a real deadlock between fpriv->fbs_lock and the modeset
* locks is impossible here since no one else but this function can get
* at it any more.
*/
list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) {
if (drm_framebuffer_read_refcount(fb) > 1) {
list_move_tail(&fb->filp_head, &arg.fbs);
} else {
list_del_init(&fb->filp_head);
/* This drops the fpriv->fbs reference. */
drm_framebuffer_put(fb);
}
}
if (!list_empty(&arg.fbs)) {
INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
schedule_work(&arg.work);
flush_work(&arg.work);
destroy_work_on_stack(&arg.work);
}
}
void drm_framebuffer_free(struct kref *kref)
{
struct drm_framebuffer *fb =
container_of(kref, struct drm_framebuffer, base.refcount);
struct drm_device *dev = fb->dev;
drm_WARN_ON(dev, !list_empty(&fb->filp_head));
/*
* The lookup idr holds a weak reference, which has not necessarily been
* removed at this point. Check for that.
*/
drm_mode_object_unregister(dev, &fb->base);
fb->funcs->destroy(fb);
}
/**
* drm_framebuffer_init - initialize a framebuffer
* @dev: DRM device
* @fb: framebuffer to be initialized
* @funcs: ... with these functions
*
* Allocates an ID for the framebuffer's parent mode object, sets its mode
* functions & device file and adds it to the master fd list.
*
* IMPORTANT:
* This functions publishes the fb and makes it available for concurrent access
* by other users. Which means by this point the fb _must_ be fully set up -
* since all the fb attributes are invariant over its lifetime, no further
* locking but only correct reference counting is required.
*
* Returns:
* Zero on success, error code on failure.
*/
int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
const struct drm_framebuffer_funcs *funcs)
{
int ret;
if (WARN_ON_ONCE(fb->dev != dev || !fb->format))
return -EINVAL;
INIT_LIST_HEAD(&fb->filp_head);
fb->funcs = funcs;
strcpy(fb->comm, current->comm);
ret = __drm_mode_object_add(dev, &fb->base, DRM_MODE_OBJECT_FB,
false, drm_framebuffer_free);
if (ret)
goto out;
mutex_lock(&dev->mode_config.fb_lock);
dev->mode_config.num_fb++;
list_add(&fb->head, &dev->mode_config.fb_list);
mutex_unlock(&dev->mode_config.fb_lock);
drm_mode_object_register(dev, &fb->base);
out:
return ret;
}
EXPORT_SYMBOL(drm_framebuffer_init);
/**
* drm_framebuffer_lookup - look up a drm framebuffer and grab a reference
* @dev: drm device
* @file_priv: drm file to check for lease against.
* @id: id of the fb object
*
* If successful, this grabs an additional reference to the framebuffer -
* callers need to make sure to eventually unreference the returned framebuffer
* again, using drm_framebuffer_put().
*/
struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
struct drm_file *file_priv,
uint32_t id)
{
struct drm_mode_object *obj;
struct drm_framebuffer *fb = NULL;
obj = __drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_FB);
if (obj)
fb = obj_to_fb(obj);
return fb;
}
EXPORT_SYMBOL(drm_framebuffer_lookup);
/**
* drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
* @fb: fb to unregister
*
* Drivers need to call this when cleaning up driver-private framebuffers, e.g.
* those used for fbdev. Note that the caller must hold a reference of its own,
* i.e. the object may not be destroyed through this call (since it'll lead to a
* locking inversion).
*
* NOTE: This function is deprecated. For driver-private framebuffers it is not
* recommended to embed a framebuffer struct info fbdev struct, instead, a
* framebuffer pointer is preferred and drm_framebuffer_put() should be called
* when the framebuffer is to be cleaned up.
*/
void drm_framebuffer_unregister_private(struct drm_framebuffer *fb)
{
struct drm_device *dev;
if (!fb)
return;
dev = fb->dev;
/* Mark fb as reaped and drop idr ref. */
drm_mode_object_unregister(dev, &fb->base);
}
EXPORT_SYMBOL(drm_framebuffer_unregister_private);
/**
* drm_framebuffer_cleanup - remove a framebuffer object
* @fb: framebuffer to remove
*
* Cleanup framebuffer. This function is intended to be used from the drivers
* &drm_framebuffer_funcs.destroy callback. It can also be used to clean up
* driver private framebuffers embedded into a larger structure.
*
* Note that this function does not remove the fb from active usage - if it is
* still used anywhere, hilarity can ensue since userspace could call getfb on
* the id and get back -EINVAL. Obviously no concern at driver unload time.
*
* Also, the framebuffer will not be removed from the lookup idr - for
* user-created framebuffers this will happen in the rmfb ioctl. For
* driver-private objects (e.g. for fbdev) drivers need to explicitly call
* drm_framebuffer_unregister_private.
*/
void drm_framebuffer_cleanup(struct drm_framebuffer *fb)
{
struct drm_device *dev = fb->dev;
mutex_lock(&dev->mode_config.fb_lock);
list_del(&fb->head);
dev->mode_config.num_fb--;
mutex_unlock(&dev->mode_config.fb_lock);
}
EXPORT_SYMBOL(drm_framebuffer_cleanup);
static int atomic_remove_fb(struct drm_framebuffer *fb)
{
struct drm_modeset_acquire_ctx ctx;
struct drm_device *dev = fb->dev;
struct drm_atomic_state *state;
struct drm_plane *plane;
struct drm_connector *conn __maybe_unused;
struct drm_connector_state *conn_state;
int i, ret;
unsigned plane_mask;
bool disable_crtcs = false;
retry_disable:
drm_modeset_acquire_init(&ctx, 0);
state = drm_atomic_state_alloc(dev);
if (!state) {
ret = -ENOMEM;
goto out;
}
state->acquire_ctx = &ctx;
retry:
plane_mask = 0;
ret = drm_modeset_lock_all_ctx(dev, &ctx);
if (ret)
goto unlock;
drm_for_each_plane(plane, dev) {
struct drm_plane_state *plane_state;
if (plane->state->fb != fb)
continue;
drm_dbg_kms(dev,
"Disabling [PLANE:%d:%s] because [FB:%d] is removed\n",
plane->base.id, plane->name, fb->base.id);
plane_state = drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state)) {
ret = PTR_ERR(plane_state);
goto unlock;
}
if (disable_crtcs && plane_state->crtc->primary == plane) {
struct drm_crtc_state *crtc_state;
drm_dbg_kms(dev,
"Disabling [CRTC:%d:%s] because [FB:%d] is removed\n",
plane_state->crtc->base.id,
plane_state->crtc->name, fb->base.id);
crtc_state = drm_atomic_get_existing_crtc_state(state, plane_state->crtc);
ret = drm_atomic_add_affected_connectors(state, plane_state->crtc);
if (ret)
goto unlock;
crtc_state->active = false;
ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
if (ret)
goto unlock;
}
drm_atomic_set_fb_for_plane(plane_state, NULL);
ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
if (ret)
goto unlock;
plane_mask |= drm_plane_mask(plane);
}
/* This list is only filled when disable_crtcs is set. */
for_each_new_connector_in_state(state, conn, conn_state, i) {
ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
if (ret)
goto unlock;
}
if (plane_mask)
ret = drm_atomic_commit(state);
unlock:
if (ret == -EDEADLK) {
drm_atomic_state_clear(state);
drm_modeset_backoff(&ctx);
goto retry;
}
drm_atomic_state_put(state);
out:
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
if (ret == -EINVAL && !disable_crtcs) {
disable_crtcs = true;
goto retry_disable;
}
return ret;
}
static void legacy_remove_fb(struct drm_framebuffer *fb)
{
struct drm_device *dev = fb->dev;
struct drm_crtc *crtc;
struct drm_plane *plane;
drm_modeset_lock_all(dev);
/* remove from any CRTC */
drm_for_each_crtc(crtc, dev) {
if (crtc->primary->fb == fb) {
drm_dbg_kms(dev,
"Disabling [CRTC:%d:%s] because [FB:%d] is removed\n",
crtc->base.id, crtc->name, fb->base.id);
/* should turn off the crtc */
if (drm_crtc_force_disable(crtc))
DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc);
}
}
drm_for_each_plane(plane, dev) {
if (plane->fb == fb) {
drm_dbg_kms(dev,
"Disabling [PLANE:%d:%s] because [FB:%d] is removed\n",
plane->base.id, plane->name, fb->base.id);
drm_plane_force_disable(plane);
}
}
drm_modeset_unlock_all(dev);
}
/**
* drm_framebuffer_remove - remove and unreference a framebuffer object
* @fb: framebuffer to remove
*
* Scans all the CRTCs and planes in @dev's mode_config. If they're
* using @fb, removes it, setting it to NULL. Then drops the reference to the
* passed-in framebuffer. Might take the modeset locks.
*
* Note that this function optimizes the cleanup away if the caller holds the
* last reference to the framebuffer. It is also guaranteed to not take the
* modeset locks in this case.
*/
void drm_framebuffer_remove(struct drm_framebuffer *fb)
{
struct drm_device *dev;
if (!fb)
return;
dev = fb->dev;
drm_WARN_ON(dev, !list_empty(&fb->filp_head));
/*
* drm ABI mandates that we remove any deleted framebuffers from active
* usage. But since most sane clients only remove framebuffers they no
* longer need, try to optimize this away.
*
* Since we're holding a reference ourselves, observing a refcount of 1
* means that we're the last holder and can skip it. Also, the refcount
* can never increase from 1 again, so we don't need any barriers or
* locks.
*
* Note that userspace could try to race with use and instate a new
* usage _after_ we've cleared all current ones. End result will be an
* in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot
* in this manner.
*/
if (drm_framebuffer_read_refcount(fb) > 1) {
if (drm_drv_uses_atomic_modeset(dev)) {
int ret = atomic_remove_fb(fb);
WARN(ret, "atomic remove_fb failed with %i\n", ret);
} else
legacy_remove_fb(fb);
}
drm_framebuffer_put(fb);
}
EXPORT_SYMBOL(drm_framebuffer_remove);
void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
const struct drm_framebuffer *fb)
{
unsigned int i;
drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
drm_printf_indent(p, indent, "refcount=%u\n",
drm_framebuffer_read_refcount(fb));
drm_printf_indent(p, indent, "format=%p4cc\n", &fb->format->format);
drm_printf_indent(p, indent, "modifier=0x%llx\n", fb->modifier);
drm_printf_indent(p, indent, "size=%ux%u\n", fb->width, fb->height);
drm_printf_indent(p, indent, "layers:\n");
for (i = 0; i < fb->format->num_planes; i++) {
drm_printf_indent(p, indent + 1, "size[%u]=%dx%d\n", i,
drm_format_info_plane_width(fb->format, fb->width, i),
drm_format_info_plane_height(fb->format, fb->height, i));
drm_printf_indent(p, indent + 1, "pitch[%u]=%u\n", i, fb->pitches[i]);
drm_printf_indent(p, indent + 1, "offset[%u]=%u\n", i, fb->offsets[i]);
drm_printf_indent(p, indent + 1, "obj[%u]:%s\n", i,
fb->obj[i] ? "" : "(null)");
if (fb->obj[i])
drm_gem_print_info(p, indent + 2, fb->obj[i]);
}
}
#ifdef CONFIG_DEBUG_FS
static int drm_framebuffer_info(struct seq_file *m, void *data)
{
struct drm_debugfs_entry *entry = m->private;
struct drm_device *dev = entry->dev;
struct drm_printer p = drm_seq_file_printer(m);
struct drm_framebuffer *fb;
mutex_lock(&dev->mode_config.fb_lock);
drm_for_each_fb(fb, dev) {
drm_printf(&p, "framebuffer[%u]:\n", fb->base.id);
drm_framebuffer_print_info(&p, 1, fb);
}
mutex_unlock(&dev->mode_config.fb_lock);
return 0;
}
static const struct drm_debugfs_info drm_framebuffer_debugfs_list[] = {
{ "framebuffer", drm_framebuffer_info, 0 },
};
void drm_framebuffer_debugfs_init(struct drm_device *dev)
{
drm_debugfs_add_files(dev, drm_framebuffer_debugfs_list,
ARRAY_SIZE(drm_framebuffer_debugfs_list));
}
#endif
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